ABSTRACT

Recently collected specimens of Umiaites from the latest Jurassic of Kutch, have facilitated a better understanding of this endemic genus. Two previously described species, Umiaites rajnathi and U. Minor, appear to be conspecific, and the former name is retained. An attempt has been made to characterize the sexual dimorphism between Proniceras and Umiaites, the latter being the macroconch.

Sabyasachi Shome. Geological Survey of India, 15 Kyd Street, Kolkata – 700016, India.
Subhendu Bardhan. Department of Geological Sciences, Jadavpur University, Kolkata – 70002, India.

KEY WORDS: Kutch; Umiaites; Proniceras; ammonite; dimorphism; Tithonian; India

PE Article Number: 12.1.2T
Copyright: Paleontological Society March 2009
Submission: 3 March 2008. Acceptance: 15 December 2008